From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5336DCD5BC9 for ; Thu, 5 Sep 2024 15:49:57 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1smEjZ-0007uM-Tm; Thu, 05 Sep 2024 11:49:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smEjX-0007t4-FH for qemu-devel@nongnu.org; Thu, 05 Sep 2024 11:49:19 -0400 Received: from dfw.source.kernel.org ([139.178.84.217]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smEjV-0001gu-N8 for qemu-devel@nongnu.org; Thu, 05 Sep 2024 11:49:19 -0400 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 626805C5AA7; Thu, 5 Sep 2024 15:49:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD28DC4CEC3; Thu, 5 Sep 2024 15:49:14 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="T0D1KC8K" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1725551353; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Y9alZaA1iGbbSl0V0o0b0DcMUnIMAn+ALqOkMYnPTg8=; b=T0D1KC8KiV5xQk0WlzDUEewZmyeLGjX7jY9bG1Tf9qJlUfehSpCnazrHHO7dkcf0HfUeve nMOPv0ZiFLfuKyFnW06E9EQPK+ZAWdDqdjYFnOjUEYFIdhyegmAIgQl0KeZRexFH5ViALR NIKK+l+agTp73yHWdgvFxI4A64qcWFk= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id fc6e8a35 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Thu, 5 Sep 2024 15:49:12 +0000 (UTC) Date: Thu, 5 Sep 2024 17:49:11 +0200 From: "Jason A. Donenfeld" To: maobibo Cc: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , loongarch@lists.linux.dev, qemu-devel@nongnu.org, xry111@xry111.site Subject: Re: qemu direct kernel boot on LoongArch Message-ID: References: <1738d60a-df3a-4102-b1da-d16a29b6e06a@t-8ch.de> <49432aed-3ed7-2f07-7f65-311faef96197@loongson.cn> <95da2e9e-0905-ad61-6bf9-c2636f2cc5f1@loongson.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Received-SPF: pass client-ip=139.178.84.217; envelope-from=SRS0=ehJl=QD=zx2c4.com=Jason@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -67 X-Spam_score: -6.8 X-Spam_bar: ------ X-Spam_report: (-6.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Sep 05, 2024 at 04:54:41PM +0200, Jason A. Donenfeld wrote: > On Thu, Sep 05, 2024 at 02:11:32PM +0800, maobibo wrote: > > > > > > On 2024/9/5 下午1:25, Thomas Weißschuh wrote: > > > On 2024-09-05 06:04:12+0000, Jason A. Donenfeld wrote: > > >> On Thu, Sep 5, 2024 at 5:45 AM maobibo wrote: > > >>> > > >>> Jason, > > >>> > > >>> With the latest qemu 9.1 version, elf format booting is supported. > > >> > > >> Thanks, I just figured this out too, about 4 minutes ago. Excellent. > > >> And the 1G minimum ram limit is gone too. > > >> > > >> Now working on how to trigger resets. > > > > > > With "reset" do you mean normal (non-panic) system shutdown/poweroff? > > > Since QEMU 9.1 and a recent kernel you can use the pvpanic device for > > > that in a cross-architecture way. > > LoongArch uses acpi GED device to reboot machine. Now there is no FDT > > table description and FDT driver for acpi GED device :( > > So you mean that QEMU exposes it via ACPI, but not via FDT, and the > kernel doesn't know how to recognize it, even with ACPI? Ahh, it looks like QEMU exposes it via ACPI, but ACPI is broken (?) when booting directly from ELF. So it needs to be exposed via FDT instead? Or ACPI needs to be fixed with direct ELF boot?